Can't shut down: machine just reboots.

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http://crunchbanglinux.org – I've had a search through the forums and have found a few posts on shutdown and reboot problems but nothing quite like this.My #! is newly installed - haven't run the cb-welcome script yet - 64 bit Waldorf 20120806 on a Toshiba Satellite L505 but ... ... I have installed Playonlinux and Wine from Synaptic and LibreOffice, Dropbox and Chrome from the menu. I've also installed Skype from their site using Gdebi-gtk. All seems fine until I come to shut the box down via Super-x or Exit from the menu. It gets as far as just before it turns the power off then reboots as if it has just (HowTos)